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-   -   Superhub : Hub4 poor performance after a few hours uptime (https://www.cableforum.uk/board/showthread.php?t=33710545)

rtho782 13-11-2021 18:40
Hub4 poor performance after a few hours uptime
 
So, my service has only been active since yesterday, but I'm already noticing weirdness with the hub4.

Once it's been up for approx 6 hours, it starts dropping ICMP pings, and pings to everywhere else get really unstable.

Stats here

The red line on the top graph is the loss, and the graph below is showing that all that loss is to the SH.

The statistics fetch time (loaded from this page) also goes way up.

Is this Puma chipset issues?

I have access to the same stats from several other SH4s, both on HFC and RFoG, and while they have some issues (such as failing to show statistics after a few days) none display this behaviour.

As you can see from the 24 hour graph, this behaviour goes away when the SH4 is rebooted.

Dropping ICMP pings is obviously not correct behaviour, but I'm more concerned with how the other pings become more unstable when it does this.

On the other hand, I don't really fancy trying to explain all this to VM over the phone.

Anyone seen similar, or have any suggestions? (I know some VM staffers are on this board!)

alanbjames 14-11-2021 02:20
Re: Hub4 poor performance after a few hours uptime
 
I have the hub 4 and have no issues like the ones u r reporting.

rtho782 14-11-2021 09:51
Re: Hub4 poor performance after a few hours uptime
 
Quote:
Originally Posted by alanbjames (Post 36101109)
I have the hub 4 and have no issues like the ones u r reporting.
Yeah, like I say I have access to monitoring on some other Hub4s, both on HFC and RFoG (I'm HFC) and not seeing it with others.

My power levels were really high tho, link, so I just added a 6dB attenuator.

Now they look much better, although maybe still high, not sure what the SH4 likes. link

Full stats from UI here:
Code:
3.0 Downstream channels
Channel        Frequency (Hz)        Power (dBmV)        SNR (dB)        Modulation        Channel ID
1        139000000        7.599998        38.983261        QAM256        1
2        147000000        7.400002        38.605377        QAM256        2
3        155000000        7.400002        38.983261        QAM256        3
4        163000000        6.800003        38.605377        QAM256        4
5        171000000        6.400002        38.605377        QAM256        5
6        179000000        6.199997        38.983261        QAM256        6
7        187000000        6.300003        38.983261        QAM256        7
8        195000000        6.000000        38.983261        QAM256        8
9        203000000        5.900002        38.983261        QAM256        9
10        211000000        5.900002        38.605377        QAM256        10
11        219000000        6.000000        38.983261        QAM256        11
12        227000000        6.099998        38.983261        QAM256        12
13        235000000        6.199997        38.605377        QAM256        13
14        243000000        6.500000        38.605377        QAM256        14
15        251000000        6.500000        38.983261        QAM256        15
16        259000000        7.199997        38.983261        QAM256        16
17        267000000        7.300003        40.366287        QAM256        17
18        275000000        7.400002        38.983261        QAM256        18
19        283000000        7.300003        38.983261        QAM256        19
20        291000000        7.500000        38.605377        QAM256        20
21        299000000        8.000000        38.983261        QAM256        21
22        307000000        8.199997        38.983261        QAM256        22
23        315000000        8.199997        40.946209        QAM256        23
24        323000000        8.000000        38.605377        QAM256        24
25        331000000        7.800003        38.605377        QAM256        25
26        339000000        8.300003        38.983261        QAM256        26
27        347000000        8.500000        40.366287        QAM256        27
28        355000000        8.500000        38.983261        QAM256        28
29        363000000        8.599998        38.983261        QAM256        29
30        371000000        8.500000        38.983261        QAM256        30
31        379000000        8.099998        38.983261        QAM256        31


3.0 Downstream channels
Channel        Lock Status        RxMER (dB)        Pre RS Errors        Post RS Errors
1        Locked        38.983261        0        0
2        Locked        38.605377        0        0
3        Locked        38.983261        0        0
4        Locked        38.605377        0        0
5        Locked        38.605377        0        0
6        Locked        38.983261        0        0
7        Locked        38.983261        0        0
8        Locked        38.983261        0        0
9        Locked        38.983261        0        0
10        Locked        38.605377        0        0
11        Locked        38.983261        0        0
12        Locked        38.983261        0        0
13        Locked        38.605377        0        0
14        Locked        38.605377        0        0
15        Locked        38.983261        0        0
16        Locked        38.983261        0        0
17        Locked        40.366287        0        0
18        Locked        38.983261        1        0
19        Locked        38.983261        0        0
20        Locked        38.605377        0        0
21        Locked        38.983261        0        0
22        Locked        38.983261        0        0
23        Locked        40.946209        1        0
24        Locked        38.605377        8        0
25        Locked        38.605377        0        0
26        Locked        38.983261        1        0
27        Locked        40.366287        0        0
28        Locked        38.983261        0        0
29        Locked        38.983261        1        0
30        Locked        38.983261        1        0
31        Locked        38.983261        3        0


3.1 Downstream channels
Channel        Channel Width (MHz)        FFT Type        Number of Active Subcarriers        Modulation (Active Profile)        First Active Subcarrier (Hz)
159        96        4K        1880        QAM4096        424


3.1 Downstream channels
Channel ID        Lock Status        RxMER Data (dB)        PLC Power (dBmV)        Correcteds (Active Profile)        Uncorrectables (Active Profile)
159        Locked        42        9.6        65322        0

Rankrotten 14-11-2021 13:17
Re: Hub4 poor performance after a few hours uptime
 
No such issues on mine over the last year with the Hub 4

rtho782 14-11-2021 15:33
Re: Hub4 poor performance after a few hours uptime
 
Quote:
Originally Posted by Rankrotten (Post 36101142)
No such issues on mine over the last year with the Hub 4
Yup, this is why I'm posting, I'm aware other hub4s are fine, I have access to monitoring on some others.

My issue is with what mine is doing, and it's definitely the hub4, rebooting other devices etc, turning off IPS, various other steps, have done nothing, while rebooting the hub4 makes the issue go away for a few hours.


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